One criteria for accessible sites is, that abbrevations or acronyms are marked with the <abbr title=.. lang=..> markup.
Markup Proposal taken from http://moinmo.in/ParserMarket/Abbreviation:
- ^WAI^ Marks the word WAI as an abbreviation and tries to retrieve the explanation from the standard abbreviation definitions page "AbbrDict"
- ^WAI|OtherPage^ Marks the word WAI as an abbreviation and tries to retrieve the explanation from the specified page "OtherPage".
- ^WAI:Web Accessibility Initiative^ Marks the word WAI as an abbreviation and uses the given explanation.
- ^WAI|language=de^, ^WAI|OtherPage|language=de^, ^WAI:Web Accessibility Initiative|language=de^ Marks the word WAI as an foreign language abbreviation (compared to the language default of the wiki and the page)
Since the <acronym> tag won't be probably part of future (X)HTML standards, only <abbr> is used in Moin to mark acronyms and abbreviations.